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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2776f962ff6a527fc8f8ecd4e1f19d3df7d2a62bdedb6854a7c511657d0ad22d' 
  AND token = 'No9Cf3xxZZnQB6mbOHJCIrzwSjPdym6QFURlpM9q7u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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