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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6292ccdd2a072c89e57c35f14f49bad427f8cc9004a1f4fa58354807ac01a8e2' 
  AND token = 's/xE3kl1LRa7mg6ViRK16rrekteYEboKQ8072PvJs34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}