SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e836a907fc13f219378e2f8d4b960cd67cb0f0e2418280ce188b82411aa4e937' 
  AND token = 'qFWX+OjfPNVZiqAbGiFNhlghBF+4ApuyiYArZZ06nc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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