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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a418188ee0f7ccf2bdcddd0e166b44c4106db13184344d1f64bc89e51f0e1003' 
  AND token = 'HeWkSgnO1CwgRJqvIqsEdaFexf55D1f+J9w3Sh+A07o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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