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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5086836ceae98e6136b7b8a6e836a38f2fc4ba8e6718b1f882f606471a8f123d' 
  AND token = '5+Qn+S7opb7y91zW/CohrYgxSEyFIchS+gkZwewjW90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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