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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f743b5b73669c84430cb48d203eeacf539fe7527b65c8e82bff6179b6ca195c' 
  AND token = '6Gub3HQ/bmLq/0X8THrsi6F+qw7A8KKTDAmCAsxKi/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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