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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '821b8bf9193d3b1fb4684cfc68bbac4600e24aaeab4c706f78b2d7a083a5cee2' 
  AND token = '42B5MrJ1H1uGwqYIxNu9PND6jWiyu1Hvx6ppce4WTMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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