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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f29dd6a5bf2f50ec320fcd0f0c1a29520f9dd4a9fdd294d4a03cda802307bd8' 
  AND token = 'b1FZgOe1MCuCMF85eINObBeoFJB/YDU/VgEIzFJWT9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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