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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fcf99b59129ec9169925291d2aa36ccc6f8e5efc9f2de0a0d44efe49ce4cee9' 
  AND token = 'wYFYNxaOQ1W5DEuzRj4GLp4aIY5gvNVUCSKbWdt9N9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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