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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6932aeaab18a60557fad00efa97ee9ec9d6e0a2b99f6f60cdf62f0af0d5c3816' 
  AND token = '5rbXz9e2CfdZDwIREpHG/S71U+wyQQcdvRWDgiaWS3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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