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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ee788ea33f2967650fde16e08e588f7200227b2efddd5c94c2e913449c6ef42' 
  AND token = 'iNxvlW8DM8VuEzpNabdI135R8kpXsHKBtQbJ1KohJzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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