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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18949a58b3f009fbf10951d8c8ac602a8aba61efa0b82650f82d951c4dc26f08' 
  AND token = 'qIgvwhXhkMj2auIxjC4nhJp0HeWAzd+hugJ8UrSHoi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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