SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba88e34e85908ff4d7bbb96031531dfe588b5bf853543c47b33ddf8f1d3f75ec' 
  AND token = 'g3v5kJ4RwGca6cbKzp/6hmBFL2cvZBPEWU1pHDVzesQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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