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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d6aa2798852104180afc4280d2a8052d7e029367805db2ae22aa43a7c4d537b' 
  AND token = 'kBKdg2TSoIZUaleuQCZPRTabH1iGkVaM/0p/15gCXaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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