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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e981d41b5fffec05076c7a191d728c92852b92b82e4c76179a0c46b1b15ff60' 
  AND token = 'MC5d8uUW6960B0agRekBmsg9dNmTXxIVCJGh92+hpWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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