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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e31a95526803d755596f66fdce7eaa7cfef1569a31d13c0bd8b3a55a902b4410' 
  AND token = 'HB5ogw2MP+6/4pIHFAXTxSLktAB/8Ae+P+Skoxy5fwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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