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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9bbefbffc933658cf2a06fc3bfba35436d3218028db2d32943191c2e26756a7' 
  AND token = 'WjNht/bouxWSe0ZAubrYTx9BChoC7aJNgdaupFGorX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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