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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1814af686b3f51389ae0e84bd2ff56fbb3c1c8754057c8961c0bc98760b7f59b' 
  AND token = '1IIqR6iBIu5VMM5X+f0CocTELxo2EE+rxIUXGjyoxug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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