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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baca772c5504a93accea77697414a714f88209407b5216218978608aae679a59' 
  AND token = 'AjBaDb0N5mABb+CzOU8aGlpKYwInURy//39xdvZOyKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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