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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df9974207795f9840239d0a47d0d1b81f0d35f2b73a8aa81962598c3df306b34' 
  AND token = '+PDm6wE70v6UUc8vlaJUOUa8bCihFd+IXB0t1dVjv9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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