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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad825f49353869d9ae93d9135c3cbc8f41fded05d37820083fe0588f7f3793e8' 
  AND token = 'ydcJVr2UEGdnz2hJutdqjp4PX2yKvjt8tQ9vhjJC88g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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