SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8900e26d5471f2327114f04bbfdeafa6132617d28aa456879afdbc77a0c867f0' 
  AND token = 'dXHhFnXduWnwlgdKGXJlv23Yv7uf+9ADps/eEdKk+ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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