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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86015fa98e69b45652d49f92a2975544961268e86559914b45348440c8db093f' 
  AND token = 'd4JLFaYymErXHD1jwMRXqcJngv/f4R8pYndTRx02Tgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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