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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01257bd3886a2d7e725bc47a449715bf6a251e096ecccc1152274e8d555cfcd4' 
  AND token = 'EqA46HLcVv9SPmFWvT8rn/MRv7MySP52I3jIHFZXkqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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