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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92b3053d8dd09d3b0f7b4ca62bdf891f84c4041baa54c10937b3e0a3993320b8' 
  AND token = 'kZJ6ACGtFL28q8woy5prXdQN39UxwiadPVPx0jojUWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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