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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '938e3552c9c54c8c0b2674d0bd42676c2f935ea806e0889241644a340a67ccae' 
  AND token = 'TZI+nHrAgKs5Y+z364LOkYabsG+xVbVxMeLm/fTfrW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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