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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04514ec322e02c15f8354c8489e8698ee4ec758b72c72c50c9d24ed852b4eef4' 
  AND token = '/0zNqjKlgh9g7qbdhK0kRPpx12pmsEFngKeESpl3VXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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