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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f4ad7373d2d690df77e1edfa65f349fe3ac7fd182bd6018c7dcac0d67413bbf' 
  AND token = 'oPSv441mfylsdSiVM4zeDmVWJ5UQXAuojDxGWOL3dPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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