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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '351b81669633e125b48625582aabcf75d57781bb293b89b54364ab1fc5c85735' 
  AND token = '2CX8uWB68xnsGZyLldVxMdLtHedfm/LZ1fPf0cbo5Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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