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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '852afdba65d8be4f8c3eadd3f28eb1b709fcf3a360e594e8939925ac835d4ce5' 
  AND token = 'pGZ4EnHluw3c84GpjuQrMzRpijDk40YlrtAT6m2UvEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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