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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38b0b5d70ffed2c273603f5c7785d0af9b1db014aaed14de2f5f473880d4505d' 
  AND token = 'ZExZIMHZE+Yq8Pn6Un/P5AEf1sjZe9HwYRredtoVMj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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