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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d07cdaeaee74c7021b9e9bf852b8c93b80bb4de316e25cbec97ec52158516c2' 
  AND token = 'N+faxsSZaiTVKx1HnKWFb+Y7io0kx59I7KEt3cjo8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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