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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef9da363ca2ebfd34a34935b64f2de879f11f209cd32a9e0560a2024fd831044' 
  AND token = 'fD69euD3ynBQ3nj3f0WqSZMlysg6CV6jrkqa2f6MXu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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