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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dca20e0f79eda4e2eb983196acfd4febacc593bdac0712543e88cf6f39f0d09' 
  AND token = '3zaaEIZ3iYV7QF5vSrW5f2BmfQd94YKutV5GxjMYYik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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