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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7edd74ca5ae941f1176dd4b904f802ad31cdd65c9a509a2fb58de8f40e7d500' 
  AND token = 'TD9hT0EdFcAJ+VKR1imJfw0MtYcx4F/ESPywqRiSB1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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