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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4b429027a04320b61344652c0d5a7fbfc863d15628b08ad2be84ba86b69e6c6' 
  AND token = 'V2Y3G3uyFUurqF5DwRflgUWttO4EUls4iFoZ3IkeMHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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