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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '598b94511ed31e20b0afb79c19bd6b4551e99cb356573462eab73b1699bc9325' 
  AND token = 'ZLwYuZK2bMT1+PMCR2X0YYyylnogHXjrvF24+xEnWY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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