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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bf5022529257f708c8365c3d67a6e02184e542b3f0920880437aac0ef79535d' 
  AND token = '7fgsxLo2PDzrVt7newJzeCQezRCLfWLPnrIrnau/zlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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