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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b189778ca56963b594de99fdf24c002b9b3a566f9e5cabcd37fa1458ca701010' 
  AND token = 'gMGT+yMPcFFw1U9VNqq9uZ1FaaE93M8WjAi77htC6Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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