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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92e3f94960b7d5acda0300e793841b03ea48a0b3799e7b001bdd3cab9ce7293c' 
  AND token = 'mNBjMNLLA3AF9+t/pQYkScrT9M3muF1tLkSCis1KyW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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