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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756d012fbe5ab9149b8fea0951dd9bb293ebeaefad708d6637cbceb87070e733' 
  AND token = 'LC5MW9uKyQeLCmSrcE4X1PtzJaWUBBKFa1bJq6HstbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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