SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dc9420f41176a18a0b60f53b996959a160f234046eddb237c7ad953ab12c17e' 
  AND token = 'FCz/SJNQG9LHStwY+lygG5IU44ZM/TFZTofY2/nM0M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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