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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c42ec46c0a4bc9e57e75c2b1b0c8a56fe46a1880ef93764a06425a485fdad09' 
  AND token = '0tlj+Azcce5NjUYU6BFWSV5VXx4AWHXk2I2EU98t2MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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