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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1fa7e267262396fa1e55163290e8067b0c59ef8be24bc3af217fc493cf8fa62' 
  AND token = 'b8FX/lNOS18/iOuxf0758m9iaRkn3JhKcphMi50Ao/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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