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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa20c9b25f467dddac669a287d991dc42235afd85e1ef10ca66cd1acccb70df9' 
  AND token = 'r6gascBbECsavpe4mRaFOnYP+E2tMKZowrNnhT0marQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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