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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cfb9f6885b15e3bf6ff93976351dbfc2cb026456cd9699219097db9679b1bd9' 
  AND token = 'BXlY0H3bmvoVYP4nkpFtLZ+hlCb5+4Y+7Ic+omUix4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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