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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7fd766cd2d505026c069ec3c1eed51529583df051882645fb7946b1f5d9c3fc' 
  AND token = 'Z5aZwpxXItYOh0aPRDNNPv6YhPWmJ6zkUx6sFHH0mEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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