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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23cfee806911c1e7b1c2b14f65597209bf4f91cbde2dd1ada2e47b65fc732fdd' 
  AND token = 'VjMiPuq59GqlyTob0agEMTrT6uaI6XXI8iuoVOG9N68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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