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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c283e84669ae2e2d7ab7a570ea3fba67d4814f4188bf083e3db1ba673806ecb' 
  AND token = 'XoTqt7/q53H5V+dGNVasKKJIgqbI5Ec2iL8eaMjS7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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