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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c50d688bc3e6252777058ad7dcc2104975d3b18e7241d0c3b41f0174a52f8185' 
  AND token = 'WDdC1JlBv4LqIhEPw8fJIak8M6Hcc/uz2A2NRArvbws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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