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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db995dc6d940e15f311ebd7e166cb2c86372da57ec62c0cf3b9b346233a5a8a3' 
  AND token = 'v+lXhXhOC1CCCph1FPrOGFXAo+Uq67hh9PEB9pUx/F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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