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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3f0bb19b80ca0a84afa48b71915682885a75f9053baba84540b256f6fc9e5f1' 
  AND token = 'bphTZ4GZlLBt9Mq9z4vc8MXypaDjst1ZbUmFj8hpNBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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