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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a05796cf2747c5559e74ea0db32caa8682884ee7fec9af33973e8c2025eab9b9' 
  AND token = 'F57uk5GlD5IT2aKxUZ0klh3QDfBG4CixQ4DO1ZWEKJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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