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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeb9342221ae7e3b6ade7bc69e39311e1a8d39931aa9bb28059a4f3f983c150d' 
  AND token = '2t8MZk2PMdYituTYNhxAOwKeT5hk5oErfZHqgDbu5EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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