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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f74ce49818c6a72661b77ec049a860be34fb6c01673601680e84d4eb6eae05e' 
  AND token = 'ari1ZEMBtn1Z5fn8Pw0xEH1kVLXvxLs3ADqY7vJ9GqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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