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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ba16eee54ea020c5f08dc0af241886bbfc4699fa2d72a9ccda5d95422e2502d' 
  AND token = 'jC5UYMJWpoLN23nHAW5UuMw+hq3S17trHC+2lh/MSWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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