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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40fdaf8e746423296fcd4499064f16ec7e3bb306ddd4447b241bbfa1b7e5e7a4' 
  AND token = 'Q9d5rpdq9xaBUPpVGJHh+39qti6xub33tTjAQve8bck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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