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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51602acbb8e5a8b6a772ad900f69a65521a68fca41508196c9266ec1ed3204bf' 
  AND token = 'HdO8IL/IVqSfcAVrg02MbSxDNG0gNX0DGvXoG71pQdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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