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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e78892eaf378e9e7f13ebbaf8d4189c77b3366ab4c8326656dfd62089e78b7e' 
  AND token = 'FkZwCLEgcBWKwhfwzFnYssWnY63cyAjBk6t48W3T7l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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