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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd77367870f63f033614045dc615f4807069c1af96d68dd2864237319b3986dec' 
  AND token = 'k9N9qY9TIN6ljflzP3cvOQIbOanBddkTddZVnPRXmv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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