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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07242900eefdafc37b14041e911f582420f3d63a42d64d35a00e0d037d763ccc' 
  AND token = 'SwX+74Q8f4ahtkPRbgokJ0mlRV7JBqru3DnmDQo3kP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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